From readings in the past my recollection is that the Sioux were quite warlike (to say the least) and the settlers were not. Many were immigrants from northern Europe and did not even have firearms. They were basically dirt scratchers eaking out a living off the land. Unlike the Scots Irish in the east who by nature itched for fights, these settlers were on the pacifist side. Memory is over 300 men, women and children were killed. Fascinating history.
Yes, many were from Germany and Scandinavia.